CN112711206A - Signal conditioning circuit, conditioning method and collection box - Google Patents
Signal conditioning circuit, conditioning method and collection box Download PDFInfo
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Abstract
The application relates to a signal conditioning circuit, a conditioning method and a collection box, wherein the conditioning circuit comprises a direct-current power supply; the wiring terminal is coupled with the direct-current power supply and comprises a power supply positive electrode port V + and a power supply negative electrode port V-; the power supply negative electrode port V-is connected with the negative electrode end of the direct current power supply; a first resistor R1, a single-pole double-throw switch SB1 and a second resistor R2 are sequentially connected between the positive electrode port V + of the power supply and the positive electrode end of the direct-current power supply; the movable contact of the single-pole double-throw switch SB1 is connected with the second resistor R2, the fixed contact A of the single-pole double-throw switch SB1 is connected with the positive electrode port V + of the power supply, and the fixed contact B of the single-pole double-throw switch SB1 is connected with the first resistor R1; the two ends of the second resistor R2 are signal output ends. The conditioning method comprises the following steps: connecting the sensor into a connecting terminal; and adjusting the switch to a corresponding state. The collection box includes: the signal conditioning circuit comprises a box body, a panel and a plurality of groups of signal conditioning circuits integrated on the panel. This application has the effect that makes sensor data acquisition device applicable in multiple sensor.
Description
Technical Field
The application relates to the technical field of signal acquisition, in particular to a signal conditioning circuit, a conditioning method and an acquisition box.
Background
Hydraulic engineering is an engineering built for controlling and allocating surface water and underground water in nature to achieve the purpose of removing harmful substances and benefiting.
In the hydraulic and hydroelectric engineering field test, a great variety of various sensors are often required to be used, and the more common sensors comprise: vibration sensors, pressure sensors, displacement sensors, liquid level sensors, flow meters, flow velocity meters, temperature sensors, pull pressure sensors, and the like. The tester needs to perform signal data acquisition for each type of sensor signal. However, the output signal types of different sensors are often different, such as a current type output sensor, a voltage type output sensor, a pulse type output sensor, and the like, and when collecting signals of multiple sensors, a special type data acquisition device needs to be used for signal data acquisition according to the signal types of the sensors.
In view of the above-mentioned related art, the inventor believes that there is a defect that the sensor data acquisition device can acquire only one type of sensor signal and is not flexible to use.
Disclosure of Invention
In order to realize that the sensor data acquisition device is applicable to various sensors, the application provides a signal conditioning circuit, a conditioning method and an acquisition box.
In a first aspect, the present application provides a signal conditioning circuit, which adopts the following technical scheme:
a signal conditioning circuit, comprising:
a direct current power supply;
the wiring terminal is coupled with the direct-current power supply and comprises a power supply positive electrode port V + and a power supply negative electrode port V-;
the power supply negative electrode port V-is connected with the negative electrode end of the direct-current power supply;
a first resistor R1, a single-pole double-throw switch SB1 and a second resistor R2 are sequentially connected between the power supply positive electrode port V + and the direct-current power supply positive electrode end;
a moving contact of the single-pole double-throw switch SB1 is connected with a second resistor R2, a static contact A of the single-pole double-throw switch SB1 is connected with a power supply positive electrode port V +, and a static contact B of the single-pole double-throw switch SB1 is connected with a first resistor R1;
and two ends of the second resistor R2 are signal output ends.
Through adopting above-mentioned technical scheme, it can make the conditioning circuit form two sets of different circuit return circuits to break off with the fingers and thumb the movable contact of single-pole double throw switch SB1 to rather than the stationary contact closure of difference, conditioning circuit can adapt the partial pressure demand of the passive sensor of two-wire system outer circuit, signal conversion that is not conform to in the collection scope of same data acquisition card with sensor input accords with same collection within range's signal, the signal that makes multiple sensor can be gathered to the same passageway of data acquisition card, and conditioning circuit's constitution is simple, be convenient for integrate and carry in small-size equipment, thereby has the effect that uses in a flexible way.
Preferably, a single-pole three-throw switch SB2 is coupled between the dc power supply and the second resistor R2, a movable contact of the single-pole three-throw switch SB2 is connected to the positive terminal of the dc power supply, a stationary contact C of the single-pole three-throw switch SB2 is disconnected in an idle state, a stationary contact D of the single-pole three-throw switch SB2 is connected to the second resistor R2, and a stationary contact E of the single-pole three-throw switch SB2 is connected to the positive terminal V + of the power supply;
the wire connecting terminal also comprises a first signal port S1 and a second signal port S2;
a third resistor R3 and a fourth resistor R4 are sequentially connected between the first signal port S1 and a stationary contact E of the single-pole-three-throw switch SB 2;
a single-pole single-throw switch SB3 is connected between the second signal port S2 and the stationary contact D of the single-pole three-throw switch SB 2;
the signal output end is connected with double-pole double-throw switch SB4, the signal output end is connected to the movable contact of double-pole double-throw switch SB4, two stationary contacts of the stationary contact group 1 of double-pole double-throw switch SB4 are connected respectively between second resistance R2 and single-pole double-throw switch SB1, between second signal port S2 and single-pole single-throw switch SB3, two stationary contacts of the stationary contact group 2 of double-pole double-throw switch SB4 are connected respectively at both ends of fourth resistance R4.
By adopting the technical scheme, the switch is pulled off, so that the movable contact of the switch and the corresponding fixed contact are closed and/or adjusted to be in a disconnected state, the sensor is connected with different resistors of the conditioning circuit, the wiring terminal is additionally provided with the first signal port S1 and the second signal port S2, the conditioning circuit can be connected with a two-wire system sensor and a three-wire system sensor, the conditioning circuit can be adapted to an external circuit active or passive sensor by additionally arranging the single-pole three-throw switch SB2, a direct-current power supply is connected or disconnected by the single-pole three-throw switch SB2, and the ports of the switches and the sensor connected with the wiring terminal are different, so that the current circuit composition of the conditioning circuit is different, the conditioning circuit can be adapted to the voltage division requirements of various types of sensors, the sensor signals of different types and different ranges are converted into voltage signals capable of being acquired by the same type of data acquisition card, and the adaptability of, the use is more flexible.
Preferably, the dc power supply is a 24V dc power supply, the resistance of the first resistor R1 is 1K Ω, and the resistance of the second resistor R2 is 250 Ω; the resistance of the third resistor R3 is 2K omega, and the resistance of the fourth resistor R4 is 1K omega.
By adopting the technical scheme, the current range output by the current type output sensor is usually the highest voltage pulse output by the 4-20mA voltage pulse type output sensor as the DC power supply voltage, the setting of the resistance value is calculated according to a current voltage formula, an ohm law and other formulas, the regulated output voltage range is 0-5V, and the data acquisition card is adapted to all data acquisition cards with the acquisition range of +/-10V, in the data acquisition card for acquiring electrical parameters in the field, the data acquisition card for acquiring the voltage value is the most convenient, high-precision and technically mature data acquisition card at present, because the over-range condition occurs when part of the sensors are used under individual working conditions, the output signal of the sensors exceeds the maximum value, the conditioning circuit conditions the sensor signal into the voltage signal of 0-5V, so that the data acquisition card with the acquisition range of +/-10V acquires and reads the conditioned voltage signal of the sensors and leaves a margin, the acquisition range of the data acquisition card within +/-10V completely covers the output signal range of the sensor, so that the loss of signals is reduced.
In a second aspect, the present application provides a signal conditioning method, which adopts the following technical scheme:
the signal conditioning method for conditioning the signal by adopting the signal conditioning circuit comprises the following steps:
connecting a sensor to be subjected to data acquisition into a corresponding port of a wiring terminal;
and adjusting the switch to a corresponding state.
By adopting the technical scheme, the sensor is connected to the corresponding port of the connecting terminal, and then the switch is adjusted to the relative state according to the type of the sensor, so that the current loop formed by the conditioning circuit can be adapted to the current type of the sensor, and the conditioning circuit can process various types of sensor signals to output voltage signals adapted to the same type of data acquisition card, and has the advantage of high adaptability.
Preferably, when the sensor type is a two-wire external circuit passive current type output sensor, signal acquisition is performed by the following method:
the sensor is respectively connected with a positive port V + of the power supply and a negative port V-of the power supply;
adjust single pole single throw switch SB3 to a closed state;
adjusting the single-pole three-throw switch SB2 to close the movable contact and the fixed contact D;
adjusting the single-pole double-throw switch SB1 until the movable contact is closed with the fixed contact A;
double pole double throw switch SB4 is adjusted to have its moving contact set closed with stationary contact set 1.
By adopting the technical scheme, the current closed loop is connected in series with the second resistor R2, the voltage range of the partial voltage of the second resistor R2 can be obtained according to the ohm's law formula, and the conditioning circuit is suitable for the passive current type output sensor of the two-wire system external circuit.
Preferably, when the sensor type is a voltage pulse type output sensor with a passive two-wire external circuit, the signal acquisition is carried out by the following method:
the sensor is respectively connected with a positive port V + of the power supply and a negative port V-of the power supply;
adjust single pole single throw switch SB3 to a closed state;
adjusting the single-pole three-throw switch SB2 to close the movable contact and the fixed contact D;
adjusting the single-pole double-throw switch SB1 to close the movable contact and the fixed contact B;
double pole double throw switch SB4 is adjusted to have its moving contact set closed with stationary contact set 1.
By adopting the technical scheme, the current closed loop is connected in series with the first resistor R1 and the second resistor R2, the voltage range of the divided voltage of the second resistor R2 can be obtained according to the ohm's law formula, and the conditioning circuit is suitable for the passive voltage pulse type output sensor of the two-wire system external circuit.
Preferably, when the sensor type is a three-wire external circuit passive voltage type output sensor, signal acquisition is performed by the following method:
the sensor is respectively connected with a positive port V + of a power supply, a negative port V-of the power supply and a first signal port S1;
adjust single pole single throw switch SB3 to a closed state;
adjusting the single-pole three-throw switch SB2 to close the movable contact and the fixed contact E;
adjusting the single-pole double-throw switch SB1 until the movable contact is closed with the fixed contact A;
double pole double throw switch SB4 is adjusted to have its moving contact set closed with stationary contact set 2.
By adopting the technical scheme, the current closed loop is connected in series with the third resistor R3 and the fourth resistor R4, the voltage range of the divided voltage of the fourth resistor R4 can be obtained according to the ohm's law formula, and the conditioning circuit is adaptive to the passive voltage type output sensor of the three-wire system external circuit.
Preferably, when the sensor type is a two-wire external circuit active current type output sensor, signal acquisition is performed by the following method:
the sensor is respectively connected with a positive port V + of the power supply and a second signal port S2;
adjust single pole single throw switch SB3 to a closed state;
adjusting the single-pole three-throw switch SB2 to close the movable contact and the fixed contact C;
adjusting the single-pole double-throw switch SB1 until the movable contact is closed with the fixed contact A;
double pole double throw switch SB4 is adjusted to have its moving contact set closed with stationary contact set 1.
By adopting the technical scheme, the current closed loop is connected in series with the second resistor R2, the voltage range of the partial voltage of the second resistor R2 can be obtained according to the ohm's law formula, and the conditioning circuit is suitable for the two-wire system external circuit active current type output sensor.
Preferably, when the sensor type is a voltage type output sensor with a two-wire external circuit active source, signal acquisition is performed by the following method:
the sensor is respectively connected with a positive port V + of the power supply and a second signal port S2;
adjust single pole single throw switch SB3 to an open state;
adjusting the single-pole three-throw switch SB2 to close the movable contact and the fixed contact C;
adjusting the single-pole double-throw switch SB1 until the movable contact is closed with the fixed contact A;
double pole double throw switch SB4 is adjusted to have its moving contact set closed with stationary contact set 1.
By adopting the technical scheme, the current sensor is directly connected with the signal output end, so that the current sensor is adaptive to the voltage type output sensor with the two-wire system external circuit active.
In a third aspect, the signal acquisition box provided by the application adopts the following technical scheme:
a signal collection box comprising:
a box body;
a panel mounted in the box body;
several sets of signal conditioning circuits as described above are integrated on the panel.
By adopting the technical scheme, the sensor is connected with the wiring terminal in the conditioning circuit, so that different types of sensor signals can be conditioned into the voltage range which can be collected by the data acquisition card, and the effects of convenient carrying and flexible use are achieved.
Drawings
Fig. 1 is a schematic structural diagram of a signal conditioning circuit according to an embodiment of the present application;
FIG. 2 is a diagram of a conditioning circuit of a passive current mode output sensor of a two-wire external circuit according to an embodiment of the present application;
FIG. 3 is a schematic diagram of an embodiment of the present application showing a passive voltage pulse type output sensor corresponding to a two-wire external circuit;
FIG. 4 is a block diagram of a three-wire external passive voltage-type output sensor;
FIG. 5 is a diagram of a conditioning circuit of an embodiment of the present application corresponding to a two-wire external circuit active current mode output sensor;
FIG. 6 is a diagram of a conditioning circuit corresponding to a two-wire external circuit active voltage type output sensor according to an embodiment of the present application;
fig. 7 is a block flow diagram of a signal conditioning method according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a signal collection box according to an embodiment of the present application.
Description of reference numerals: 1. a box body; 2. a panel; 3. arranging a female needle thread head; 4. a socket shaped like a Chinese character 'pin'; 5. touch screen industry panel computer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to fig. 1-8 and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The embodiment of the application discloses a signal conditioning circuit. Referring to fig. 1, the signal conditioning circuit includes:
a direct current power supply.
And the wiring terminal is coupled with the direct current power supply and comprises a power supply positive electrode port V + and a power supply negative electrode port V-.
And the power supply negative electrode port V-is connected with the negative electrode end of the direct current power supply.
A first resistor R1, a single-pole double-throw switch SB1 and a second resistor R2 are sequentially connected between the positive electrode port V + of the power supply and the positive electrode end of the direct-current power supply.
The movable contact of the single-pole double-throw switch SB1 is connected with the second resistor R2, the stationary contact A of the single-pole double-throw switch SB1 is connected with the positive electrode port V + of the power supply, and the stationary contact B of the single-pole double-throw switch SB1 is connected with the first resistor R1.
The two ends of the second resistor R2 are signal output ends.
In this embodiment, the dc power source is a 24V dc power source, and the data acquisition card connected to the signal output terminal for acquiring the conditioned sensor signal may be an NI9205 data acquisition card, an NI9206 data acquisition board, a USB-6003 data acquisition board, or the like, the resistance values of the first resistor R1 and the second resistor R2 are adjusted according to the signal acquisition range of the adopted data acquisition card, further adjusting the proportion of the partial pressure, and finally enabling the conditioned sensor signal to meet the acquisition range of the acquisition board card, the reason why the NI9205 data acquisition card is adopted in the embodiment is that in the current acquisition of all electrical parameters, the detection and collection of the voltage signal are most convenient, the precision is the highest, the technology is the most mature, the NI9205 data collecting card has the advantages of higher cost performance and high collection precision in the voltage signal collecting device, the voltage signal acquisition range which can be acquired by the NI9205 data acquisition card is-10V to + 10V.
Based on the conditioned sensor signal output by the signal output end collected by the NI9205 data acquisition card, in this embodiment, the resistance of the first resistor R1 is 1K Ω, and the resistance of the second resistor R2 is 250 Ω, and the conditioning circuit of this embodiment is applicable to a current type output sensor whose sensor type is a two-wire system external circuit passive and a voltage pulse type output sensor whose sensor type is a two-wire system external circuit passive.
Referring to fig. 1 and 2, the passive current type output sensor of the two-wire system external circuit generally has a pressure sensor, a differential pressure sensor, a liquid level sensor, an electromagnetic flow sensor, etc., the output signal of the sensor is a 4-20mA current signal, the passive current type output sensor of the two-wire system external circuit is correspondingly connected to a power supply positive electrode port V + and a power supply negative electrode port V-, the conditioning circuit is realized by closing a static contact a of a movable contact of a single-pole double-throw switch SB1, adding a 250 Ω second resistor R2 into the two-wire system circuit of the sensor, and using two ends of the second resistor R2 as signal output ends connected with an acquisition port of an NI9205 data acquisition card according to ohm's law: 4mA 250 omega =1V, 20mA 250 omega =5V, the two-wire system external circuit passive current type output sensor outputs 4-20mA current signal and converts 1-5V voltage signal, can be discerned and gathered by NI9205 data acquisition card.
Referring to fig. 1 and 3, a passive voltage pulse type output sensor of a two-wire system external circuit, such as a current meter, wherein the signal of the current meter is a switching value, the current meter is turned on and off once every rotation, some current meters are turned on and off twice or more, the number of turns of the current meter per unit time in the circuit is identified, the number of turns of the current meter can be calculated, and then the flow is calculated, the signal of the current meter belongs to the switching value, the high level = 24V supplied by a direct current power supply, and the low level = 0V supplied by the circuit.
A voltage signal generated by the current meter is divided by a conditioning circuit, and the specific realization method is that a movable contact of a single-pole double-throw switch SB1 is closed to a fixed contact B, the output end circuit of the current meter is connected in series with a second resistor R2 of 250 omega and a first resistor R1 of 1k omega, and two ends of the second resistor R2 are signal output ends connected with an acquisition port of an NI9205 data acquisition card.
The high level signal of the current meter is divided into 4.8V voltage signals by the conditioning circuit, and the principle of the voltage dividing circuit is as follows: 24V 250/1250=4.8V, the low level signal is still 0V, which can be recognized and collected by the NI9205 data acquisition card.
Some sensors are used under individual working conditions and have an over-range phenomenon, the output of the sensors exceeds the maximum value under the phenomenon, and in order to enable the acquisition range of the acquisition board card to completely cover the output signal range of the sensors and enable acquisition to leave margin, the conditioning circuit converts signals output by the sensors into voltage signals in the range of 0-5V.
Referring to fig. 1, in an embodiment, a single-pole-three-throw switch SB2 is coupled between the dc power supply and the second resistor R2, a movable contact of the single-pole-three-throw switch SB2 is connected to the positive terminal of the dc power supply, a stationary contact C of the single-pole-three-throw switch SB2 is disconnected in a neutral state, a stationary contact D of the single-pole-three-throw switch SB2 is connected to the second resistor R2, and a stationary contact E of the single-pole-three-throw switch SB2 is connected to the positive terminal V + of the power supply.
The wire connecting terminal also comprises a first signal port S1 and a second signal port S2.
A third resistor R3 and a fourth resistor R4 are connected between the first signal port S1 and the stationary contact E of the single-pole-three-throw switch SB2 in sequence.
A single-pole single-throw switch SB3 is connected between the second signal port S2 and the stationary contact D of the single-pole three-throw switch SB 2.
The signal output end is connected with a double-pole double-throw switch SB4, the moving contact of the double-pole double-throw switch SB4 is connected with the signal output end, two static contacts of a static contact group 1 of the double-pole double-throw switch SB4 are respectively connected between a second resistor R2 and the single-pole double-throw switch SB1 and between a second signal port S2 and a single-pole single-throw switch SB3, and two static contacts of a static contact group 2 of the double-pole double-throw switch SB4 are respectively connected with two ends of a fourth resistor R4.
In this embodiment, the single-pole single-throw switch SB3, the single-pole double-throw switch SB1, the double-pole double-throw switch SB4, and the single-pole three-throw switch SB2 are snapped to corresponding contacts, so that the input signals of the sensors with different analog signal types can be conditioned and converted into voltage signals in a desired range.
In this embodiment, the data acquisition card connected to the signal output end to acquire the conditioned sensor signal may also adopt an NI9205 data acquisition card, an NI9206 type data acquisition board, a USB-6003 data acquisition board, and the like, and the resistances of the first resistor R1 and the second resistor R2, the resistances of the third resistor R3, and the fourth resistor R4 are adjusted according to the signal acquisition range of the adopted data acquisition card, so as to adjust the voltage division ratio, and finally make the conditioned sensor signal satisfy the acquisition range of the data acquisition card, in this embodiment, the NI9205 data acquisition card is still adopted.
The resistance value of the third resistor R3 is 2K omega, the resistance value of the fourth resistor R4 is 1K omega, and the setting of the resistance values enables the voltage signals output by the signal output end to be adaptive to all data acquisition cards with the data acquisition range of +/-10V.
Referring to fig. 1 and 4, in an embodiment, the sensor type is a three-wire external circuit passive voltage type output sensor, such as an eddy current probe sensor, a vibration sensor, etc., the signals output by the eddy current probe sensor and the vibration sensor are 0-15V voltage signals, which exceed the identification range of NI9205 data acquisition card ± 10V, so the voltage is divided by a conditioning circuit, specifically, the sensor is connected to a power supply positive port V +, a power supply negative port V-and a first signal port S1, the single-pole single-throw switch SB3 is closed, a moving contact of the single-pole three-throw switch SB2 is closed to a stationary contact E thereof, a moving contact of the single-pole double-throw switch SB1 is closed to a stationary contact a Ω thereof, the double-pole double-throw switch SB4 is closed to a stationary contact group 2 thereof, that is, 1k fourth resistor R4 and 1k 2k third resistor R3 are added in series to the circuit of the first signal port S1 connected to the sensor, the output signal of the sensor is divided and conditioned into 0-5V voltage signals, and the principle of a voltage dividing circuit is as follows: 15V 1000/3000=5V, recognizable and collectable by the NI9205 data acquisition card.
Referring to fig. 1 and 5, in an embodiment, when the input sensor type is a two-wire external circuit active current type output, such as a power transmitter, an isolation module for outputting current signals, and the like, the output signals of the power transmitter and the isolation module for outputting current signals are 4-20mA current signals, which cannot be directly identified and collected by an NI9205 data acquisition card, the conditioning circuit is specifically implemented by connecting the sensor to a positive power port V + and a second signal port S2, closing a single-pole single-throw switch SB3, closing a movable contact and a fixed contact C of a single-pole three-throw switch SB2, closing a movable contact and a fixed contact a of a single-pole double-throw switch SB1, closing a double-pole double-throw switch SB4 and a fixed contact group 1 thereof, that is, 1 Ω 250 Ω second resistor R2 is added in series to a circuit of a second signal port S2 of the sensor, so that the 4-20mA current signals are converted into 1-5V voltage signals, according to ohm's law: 4mA 250 omega =1V, 20mA 250 omega =5V, can be identified and collected by the NI9205 data acquisition card.
Referring to fig. 1 and 6, when the device type is a voltage type signal output type device with a two-wire external circuit active, for example, an isolation module outputting a voltage signal, and the output voltage range of the isolation module outputting the voltage signal is 1-5V, the specific implementation manner of the regulating circuit is to connect the isolation module into a positive power port V + and a second signal port S2, disconnect the single-pole single-throw switch SB3, close a moving contact of the single-pole three-throw switch SB2 and a stationary contact C thereof, close a moving contact of the single-pole double-throw switch SB1 and a stationary contact a thereof, close the double-pole double-throw switch SB4 and a stationary contact group 1 thereof, and enable an NI9205 data acquisition card to acquire the voltage value of the isolation module outputting the voltage signal.
Referring to fig. 1 and fig. 6, the present embodiment further discloses a multifunctional signal conditioning method applied to a hydraulic engineering field test, including:
and connecting the sensor to be subjected to data acquisition into a corresponding port of the wiring terminal.
And adjusting the switch to a corresponding state.
When the sensor type is a two-wire system external circuit passive current type output sensor, signal acquisition is carried out by the following method:
the sensor is respectively connected with a positive port V + of the power supply and a negative port V-of the power supply.
Adjust single pole single throw switch SB3 to a closed state.
The single pole, triple throw switch SB2 is adjusted to close the moving contact with the stationary contact D.
The single pole double throw switch SB1 is adjusted to close the moving contact with the stationary contact a.
Double pole double throw switch SB4 is adjusted to have its moving contact set closed with stationary contact set 1.
When the sensor type is a voltage pulse type output sensor with a passive two-wire system external circuit, signal acquisition is carried out by the following method:
the sensor is respectively connected with a positive port V + of the power supply and a negative port V-of the power supply.
Adjust single pole single throw switch SB3 to a closed state.
The single pole, triple throw switch SB2 is adjusted to close the moving contact with the stationary contact D.
The single pole double throw switch SB1 is adjusted to close the moving contact with the stationary contact B.
Double pole double throw switch SB4 is adjusted to have its moving contact set closed with stationary contact set 1.
When the sensor type is a three-wire system external circuit passive voltage type output sensor, signal acquisition is carried out by the following method:
the sensor is respectively connected with a positive port V + of a power supply, a negative port V-of the power supply and a first signal port S1.
Adjust single pole single throw switch SB3 to a closed state.
The single pole, triple throw switch SB2 is adjusted to close the moving contact with the stationary contact E.
The single pole double throw switch SB1 is adjusted to close the moving contact with the stationary contact a.
Double pole double throw switch SB4 is adjusted to have its moving contact set closed with stationary contact set 2.
When the sensor type is a two-wire system external circuit active current type output sensor, signal acquisition is carried out by the following method:
the sensor is connected with a power supply positive electrode port V + and a second signal port S2 respectively.
Adjust single pole single throw switch SB3 to a closed state.
The single pole, triple throw switch SB2 is adjusted to close the moving contact with the stationary contact C.
The single pole double throw switch SB1 is adjusted to close the moving contact with the stationary contact a.
Double pole double throw switch SB4 is adjusted to have its moving contact set closed with stationary contact set 1.
When the sensor type is a voltage type output sensor with a two-wire system external circuit active source, signal acquisition is carried out by the following method:
the sensor is connected with a power supply positive electrode port V + and a second signal port S2 respectively.
Adjust single pole single throw switch SB3 to an open state.
The single pole, triple throw switch SB2 is adjusted to close the moving contact with the stationary contact C.
The single pole double throw switch SB1 is adjusted to close the moving contact with the stationary contact a.
Double pole double throw switch SB4 is adjusted to have its moving contact set closed with stationary contact set 1.
This embodiment still discloses a signal acquisition box, and signal acquisition box includes: the signal conditioning circuit comprises a box body 1, a panel 2 arranged in the box body 1 and a plurality of groups of signal conditioning circuits integrated on the panel 2.
In theory, the number of groups of signal conditioning circuits arranged on the panel 2 can be infinitely increased, but in practice, the user requirements and the lightness and portability of the device are considered, so in the embodiment, 32 groups of signal conditioning circuits are arranged to adapt to an NI9205 data acquisition card with 32 channels, the NI9205 data acquisition card needs to be connected to a notebook computer, various different sensor signals are uniformly conditioned and converted into voltage signals which can be identified and acquired by the NI9205 data acquisition card through the conditioning circuits, the signals are uniformly transmitted into the NI9205 data acquisition card, finally, the NI9205 data acquisition card transmits the conditioning signals of each sensor to the notebook computer through internal analog-to-digital conversion, and the notebook computer performs final signal storage and oscillography display.
The panel 2 is provided with a pin row line female head 3, the pin row line female head 3 is correspondingly connected with the signal output end of the conditioning circuit, and the pin row line female head 3 is used for being externally connected with a data acquisition card and transmitting the voltage signal conditioned and converted by the conditioning circuit to the data acquisition card.
Optionally, a touch screen industrial tablet computer 5 is further installed on the inner side of the box body, when the sensor signals are collected and displayed, a data collection card is connected to the touch screen industrial tablet computer 5 through a USB data line, collection analysis software is installed in the touch screen industrial tablet computer 5 in advance, and the received conditioned sensor signals are analyzed and displayed through the collection analysis software.
In the embodiment, the size of the touch screen industrial tablet computer 5 is 10 inches in consideration of factors such as actual use conditions and portability of carrying, but in actual use, different sizes can be replaced according to actual requirements.
Install article word socket 4 on panel 2, insert 220V alternating current in order to give the direct current power supply power through article word socket 4, be connected with the direct current voltmeter between direct current power supply ' S positive terminal and negative terminal, the direct current voltmeter is used for showing the voltage of direct current power supply output, article word socket 4 ' S zero line, all be equipped with metal button switch S1 between live wire and the direct current power supply, at direct current power supply ' S positive terminal, all be equipped with metal button switch S2 between the both ends of negative terminal and direct current voltmeter, in this embodiment, the direct current voltmeter has following effect:
(1) the direct-current voltmeter is used for monitoring whether the direct-current power supply normally outputs 24V power supply, if the metal button switch S2 is pressed, the direct-current voltmeter displays 24V, the direct-current power supply works normally, and if the display is 0, the direct-current power supply works abnormally.
(2) When the external sensor needs the direct-current power supply to work, the direct-current power supply is turned off in the process of debugging the sensor or wiring the sensor, and the direct-current voltmeter is used for displaying the power supply state of the external sensor so as to confirm the power supply state of the direct-current power supply when the sensor is operated.
(3) When a sensor connected to the outside is short-circuited or the load of the external sensor is too high, the output voltage of the direct-current power supply is reduced, the direct-current voltage representation number is far lower than 24V, and a user judges whether the external input has the conditions of sensor short-circuit and sensor load overhigh through the direct-current voltage representation number.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules, so as to perform all or part of the functions described above.
Claims (10)
1. A signal conditioning circuit, comprising:
a direct current power supply;
the wiring terminal is coupled with the direct-current power supply and comprises a power supply positive electrode port V + and a power supply negative electrode port V-;
the power supply negative electrode port V-is connected with the negative electrode end of the direct-current power supply;
a first resistor R1, a single-pole double-throw switch SB1 and a second resistor R2 are sequentially connected between the power supply positive electrode port V + and the direct-current power supply positive electrode end;
a moving contact of the single-pole double-throw switch SB1 is connected with a second resistor R2, a static contact A of the single-pole double-throw switch SB1 is connected with a power supply positive electrode port V +, and a static contact B of the single-pole double-throw switch SB1 is connected with a first resistor R1;
and two ends of the second resistor R2 are signal output ends.
2. The signal conditioning circuit according to claim 1, wherein a single-pole three-throw switch SB2 is coupled between the dc power supply and the second resistor R2, a movable contact of the single-pole three-throw switch SB2 is connected to a positive terminal of the dc power supply, a stationary contact C of the single-pole three-throw switch SB2 is disconnected in a neutral state, a stationary contact D of the single-pole three-throw switch SB2 is connected to the second resistor R2, and a stationary contact E of the single-pole three-throw switch SB2 is connected to a positive terminal V + of the power supply;
the wire connecting terminal also comprises a first signal port S1 and a second signal port S2;
a third resistor R3 and a fourth resistor R4 are sequentially connected between the first signal port S1 and a stationary contact E of the single-pole-three-throw switch SB 2;
a single-pole single-throw switch SB3 is connected between the second signal port S2 and the stationary contact D of the single-pole three-throw switch SB 2;
the signal output end is connected with double-pole double-throw switch SB4, the signal output end is connected to the movable contact of double-pole double-throw switch SB4, two stationary contacts of the stationary contact group 1 of double-pole double-throw switch SB4 are connected respectively between second resistance R2 and single-pole double-throw switch SB1, between second signal port S2 and single-pole single-throw switch SB3, two stationary contacts of the stationary contact group 2 of double-pole double-throw switch SB4 are connected respectively at both ends of fourth resistance R4.
3. The signal conditioning circuit of claim 1 wherein the dc power supply is a 24V dc power supply, the first resistor R1 has a resistance of 1K Ω, and the second resistor R2 has a resistance of 250 Ω; the resistance of the third resistor R3 is 2K omega, and the resistance of the fourth resistor R4 is 1K omega.
4. A method of signal conditioning using the signal conditioning circuit of any of claims 1-3 for signal conditioning, comprising the steps of:
connecting a sensor to be subjected to data acquisition into a corresponding port of a wiring terminal;
and adjusting the switch to a corresponding state.
5. The signal conditioning method of claim 4,
when the sensor type is a two-wire system external circuit passive current type output sensor, signal acquisition is carried out by the following method:
the sensor is respectively connected with a positive port V + of the power supply and a negative port V-of the power supply;
adjust single pole single throw switch SB3 to a closed state;
adjusting the single-pole three-throw switch SB2 to close the movable contact and the fixed contact D;
adjusting the single-pole double-throw switch SB1 until the movable contact is closed with the fixed contact A;
double pole double throw switch SB4 is adjusted to have its moving contact set closed with stationary contact set 1.
6. The signal conditioning method of claim 4,
when the sensor type is a voltage pulse type output sensor with a passive two-wire system external circuit, signal acquisition is carried out by the following method:
the sensor is respectively connected with a positive port V + of the power supply and a negative port V-of the power supply;
adjust single pole single throw switch SB3 to a closed state;
adjusting the single-pole three-throw switch SB2 to close the movable contact and the fixed contact D;
adjusting the single-pole double-throw switch SB1 to close the movable contact and the fixed contact B;
double pole double throw switch SB4 is adjusted to have its moving contact set closed with stationary contact set 1.
7. The signal conditioning method of claim 4,
when the sensor type is a three-wire system external circuit passive voltage type output sensor, signal acquisition is carried out by the following method:
the sensor is respectively connected with a positive port V + of a power supply, a negative port V-of the power supply and a first signal port S1;
adjust single pole single throw switch SB3 to a closed state;
adjusting the single-pole three-throw switch SB2 to close the movable contact and the fixed contact E;
adjusting the single-pole double-throw switch SB1 until the movable contact is closed with the fixed contact A;
double pole double throw switch SB4 is adjusted to have its moving contact set closed with stationary contact set 2.
8. The signal conditioning method of claim 4,
when the sensor type is a two-wire system external circuit active current type output sensor, signal acquisition is carried out by the following method:
the sensor is respectively connected with a positive port V + of the power supply and a second signal port S2;
adjust single pole single throw switch SB3 to a closed state;
adjusting the single-pole three-throw switch SB2 to close the movable contact and the fixed contact C;
adjusting the single-pole double-throw switch SB1 until the movable contact is closed with the fixed contact A;
double pole double throw switch SB4 is adjusted to have its moving contact set closed with stationary contact set 1.
9. The signal conditioning method of claim 4,
when the sensor type is a voltage type output sensor with a two-wire system external circuit active source, signal acquisition is carried out by the following method:
the sensor is respectively connected with a positive port V + of the power supply and a second signal port S2;
adjust single pole single throw switch SB3 to an open state;
adjusting the single-pole three-throw switch SB2 to close the movable contact and the fixed contact C;
adjusting the single-pole double-throw switch SB1 until the movable contact is closed with the fixed contact A;
double pole double throw switch SB4 is adjusted to have its moving contact set closed with stationary contact set 1.
10. A signal collection box, comprising:
a box body (1);
a panel (2) installed in the box body (1);
sets of signal conditioning circuits according to claims 1-3 as above, integrated on a panel (2).
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| JP2010130557A (en) * | 2008-11-28 | 2010-06-10 | Yaskawa Electric Corp | Gate driving device |
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